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Sonographic assessment of finger flexor tendons in Olympic archers/ Olimpik okcularda parmak fleksor tendonlarinin sonografik degerlendirmesi.

Introduction

Tendons exposed to chronic overloading are injured and/or undergo adaptation via biomechanical, biochemical or structural changes. Overuse type of tendon injuries are among the most common musculoskeletal pathologies in recreational and competitive athletes; and the structural changes have been widely reported (1). Load-induced structural changes, especially hypertrophy, have been also studied in tendons of animals and healthy subjects (2-11). On the other hand, relevant data regarding asymptomatic athletes are scarce (6,10,12). Likewise, in archery, finger flexor tendons undergo considerable loading during shooting, however, to our best knowledge, possible structural changes in the finger flexor tendons of archers have not been assessed. Therefore, in this study, we aimed to demonstrate the possible hypertrophy of the finger flexor tendons of archers by using sonography.

Material and Methods

Thirteen Olympic archery athletes (9 M; 4 F) were enrolled in the study. None of the participants had any symptom of overuse injury in their hands at the time of the study. Sonographic measurements, which is an acceptable method for evaluating the tendons (13), were performed by a single physiatrist experienced in musculoskeletal sonography, using a lineer array probe of 8-16 MHz (Diasus Dynamic Imaging Ltd., Scotland, UK). The second, third and fourth flexor digitorum profundus (FDP) tendons of the string and bow hands were visualized both axially and longitudinally. During the examination, the patients were seated in a comfortable position with their hands and fingers supported so as to keep a position of slight wrist extension with the metacarpophalangeal, proximal interphalangeal and the distal interphalangeal joints in full extension. The angle of the ultrasound beam was kept perpendicular to the surfaces of the tendons to have the highest echogenic view. Measurements of the FDP tendons were performed axially at the midportion of the middle phalanx. Mediolateral (width) and anteroposterior (thickness) diameters were noted. Cross- sectional area (CSA) was measured using continuous boundary trace of the tendons excluding the surrounding hypoechoic fat (Figure 1). The tendons were evaluated longitudinally for any pathological finding suggesting tendonitis, tendinosis or rupture.

SPSS 15.0 was used for statistical analysis. Tendon thickness, width and CSA of the FDP tendons of the string and bow hands were compared using nonparametric Wilcoxon test. Statistical significance was set at p<0.05.

Results

The mean age of the participants, age of sports, draw weight, maximum FITA (from the French, Federation Internationale de Tir a l'Arc) scores, the number of training per week and total number of arrows shot per training were 26.3 [+ or -] 3.9 years, 11.9 [+ or -] 2.8 years, 19.8 [+ or -] 2.3 kg, 1293 [+ or -] 36.5, 4.9[+ or -]1.4 and 207.3 [+ or -]87.2, respectively. Tendon thickness, width and CSA of the FDP tendons of the string and bow hands are given in Table-1. Thickness, width and CSA values of the fourth fingers were all increased in the string hands compared to the bow hands; however, those differences pertaining to tendon thickness and CSA reached statistical significance (p<0.05). The values of the second and third fingers were similar (p>0.05). Any pathological finding of tendinopathy was not observed.

[FIGURE 1 OMITTED]

Discussion

In this study, we have assessed the possible structural changes of the FDP tendons in asymptomatic Olympic archery athletes, for the first time in the literature, by using sonographic imaging. Our main finding was hypertrophy of the FDP in the fourth finger on the string hands of the archers. Since during shooting the third and fourth fingers of the string hand undergo considerable loading (especially the fourth finger just before shooting), we considered our results worthy of discussion.

Tendons are able to adapt their mechanical and morphological properties in response to mechanical loading. In the literature, the effect of exercise training on tendon structure was evaluated in human (healthy subjects and athletes) and animal studies, however, results were controversial. Patellar tendon CSA was found to be regionally increased in healthy subjects who underwent 9-12 weeks of knee extension resistance training and on the lead extremity of elite athletes (fencers and badminton players) (2-4). Moreover, Achilles tendon hypertrophy was detected with mechanical loading of the tendon in healthy subjects and athletes (5,6,12). In animal studies, larger superficial digital flexor and common digital extensor tendon CSAs were found in exercise training group of horses (7). In accordance with these results, we have found increased CSA of the FDP in Olympic archery athletes, possibly due to repetitive overloading during shooting. Although in some human and animal studies exercise and sport-induced tendon hypertrophy has been observed, the results were not statistically significant when compared with the non-exercised subjects (10,11). In other studies, no significant tendon hypertrophy was detected with resistance training in elderly human (8,9). This discrepancy may be explained by the differences between mode and duration of training exercises (endurance vs. resistance) and the features of participants (age, sex etc.) enrolled in these studies. Likewise, Magnusson et al. (14) observed that habitual training results in patellar tendon hypertrophy in men but not in women.

It is still of debate whether tendon hypertrophy induced by chronic training results from a physiological response to reduce tissue stress or from a tissue repair response to damage induced by repeated loading. Since histopathological assessment could not be performed in our study, we cannot definitely say that tendon hypertrophy was due to physiologic response to overloading.

Conclusions

In the light of our first and preliminary results, we imply that the FDP tendons of archers tend to hypertrophy on their string hands. Further studies with larger samples are needed to also assess the mechanical properties of these tendons both with regard to their functional properties and injured risk.

DOI: 10.4274/tftr.59013

Conflict of Interest:

Authors reported no conflicts of interest.

References

(1.) Sharma P Maffulli N. Tendon injury and tendinopathy: healing and repair. J Bone Joint Surg Am 2005;87:187-202.

(2.) Seynnes OR, Erskine RM, Maganaris CN, Longo S, Simoneau EM, Grosset JF et al. Training-induced changes in structural and mechanical properties of the patellar tendon are related to muscle hypertrophy but not to strength gains. J Appl Physiol 2009;107:523-30.

(3.) Kongsgaard M, Reitelseder S, Pedersen TG, Holm L, Aagaard P, Kjaer M, et al. Region specific patellar tendon hypertrophy in humans following resistance training. Acta Physiol (Oxf) 2007;191:111-21.

(4.) Couppe C, Kongsgaard M, Aagaard P, Hansen P, Bojsen-Moller J, Kjaer M, et al. Habitual loading results in tendon hypertrophy and increased stiffness of the human patellar tendon. J Appl Physiol 2008;105:805-10.

(5.) Arampatzis A, Karamanidis K, Albracht K. Adaptational responses of the human Achilles tendon by modulation of the applied cyclic strain magnitude. J Exp Biol 2007;210:2743-53.

(6.) Magnusson SP, Kjaer M. Region-specific differences in Achilles tendon cross-sectional area in runners and non- runners. Eur J Appl Physiol 2003;90:549-53.

(7.) Kasashima Y, Smith RK, Birch HL, Takahashi T, Kusano K, Goodship AE. Exercise-induced tendon hypertrophy: cross- sectional area changes during growth are influenced by exercise. Equine Vet J Suppl 2002;34:264-8.

(8.) Reeves ND, Maganaris CN, Narici MV. Effect of strength training on human patella tendon mechanical properties of older individuals. J Physiol 2003;548:971-81.

(9.) Reeves ND, Narici MV, Maganaris CN. Strength training alters the viscoelastic properties of tendons in elderly humans. Muscle Nerve 2003;28:74-81.

(10.) Kallinen M, Suominen H. Ultrasonographic measurements of the Achilles tendon in elderly athletes and sedentary men. Acta Radiol 1994;35:560-3.

(11.) Woo SL, Gomez MA, Amiel D, Ritter MA, Gelberman RH, Akeson WH. The effects of exercise on the biomechanical and biochemical properties of swine digital flexor tendons. J Biomech Eng 1981;103:51-6.

(12.) Kongsgaard M, Aagaard P, Kjaer M, Magnusson SP. Structural Achilles tendon properties in athletes subjected to different exercise modes and in Achilles tendon rupture patients. J Appl Physiol 2005;99:1965-71.

(13.) Fredberg U, Bolvig L, Andersen NT, Stengaard-Pedersen K. Ultrasonography in evaluation of Achilles and patella tendon thickness. Ultraschall Med 2008;29:60-5.

(14.) Magnusson SP, Hansen M, Langberg H, Miller B, Haraldsson B, Westh EK, et al. The adaptability of tendon to loading differs in men and women. Int J Exp Pathol 2007;88:237-40.

Bayram KAYMAK, Levent OZCAKAR, Hayri ERTAN *, Ismail KARABULUT **, Aysen AKINCI

Hacettepe University Medical School, Department of Physical Medicine and Rehabilitation, Ankara, Turkey

* Anadolu University School of Physical Education and Sports, Eskisehir, Turkey

** Hacettepe University Medical School, Department of Physiology, Ankara, Turkey

Address for Correspondence:/Yazisma Adresi: Bayram Kaymak MD, Anadolu University, School of Physical Education and Sports, Eskisehir, Turkey

Phone: +90 312 309 41 42 E-mail: bayramkaymak@yahoo.com

Received/Gelis Tarihi: January/Ocak 2011 Accepted/Kabul Tarihi: March/Mart 2011
Table 1. Sonographic measurements of flexor digitorum profundus
tendons of the second, third and fourth fingers of the archers.

Fingers String Hand Bow hand p

Second
Thickness (mm) 2.05 (0.35) 2.01 (0.16) 1.00
Width (mm) 3.85 (0.68) 3.88 (0.46) 0.25
CSA ([mm.sup.2] 6.19 (1.54) 6.12 (0.88) 0.92

Third
Thickness 2.05 (0.22) 2.11 (0.22) 0.16
Width 3.88 (0.61) 3.81 (0.45) 0.51
CSA 6.21 (1.06) 6.3 (1.98) 0.81

Fourth
Thickness 1.99 (0.23) 1.84 (0.19) 0.01
Width 3.78 (0.41) 3.52 (0.51) 0.07
CSA 5.91 (0.99) 5.13 (1.17) 0.03
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Title Annotation:Original Article/Orijinal Makale
Author:Kaymak, Bayram; Ozcakar, Levent; Ertan, Hayri; Karabulut, Ismail; Akinci, Aysen
Publication:Turkish Journal of Physical Medicine and Rehabilitation
Date:Jun 1, 2012
Words:1583
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